To study the effect of tip clearance on unsteady flow in a tubular turbine, full-channel numerical calculation was carried out based SST k–ω turbulence model using power-plant prototype as research object. Tip leakage characteristics three δ schemes were compared. The results show that value is directly proportional to axial velocity, momentum, and sum but inversely turbulent kinetic energy. At...

The k-ω Shear Stress Transport (SST) turbulence model is adopted to study the hydrodynamic performance of the water-jet axial pump which is applied in Unmanned Surface Vehicle (USV). The numerical simulation of the whole passage of the water-jet pump is carried out for four different tip clearance with δ = 0.3 mm, δ = 0.8 mm, δ = 1 mm and δ = 1.4 mm. And the results, in term of external charact...

Tip-leakage flow occurs in the tip-clearance region of helico-axial multi-phase pumps, and this reduces their working performance. In study, a structural modification, form inclusion “squealers” on impeller blade tips, was adopted to reduce tip-leakage pump, thereby improving its Numerical simulations were conducted examine impact patterns geometric parameters such as depth, shape, size squeale...

A large-eddy simulation has been performed to study the temporal and spatial dynamics of a rotor tip-clearance flow, with the objective of determining the underlying mechanisms for low pressure fluctuations downstream of the tip-gap. Simulation results are compared with experimental measurements, and favorable agreements are observed in both qualitative and quantitative sense. Typical vortical ...